Abstract
Abstract The LHCb Ring-Imaging Cherenkov (RICH) detector system has been operated with very high availability in the LHCb experiment since 2009, performing charged hadron identification in a wide momentum range with high efficiency and providing crucial information for most physics analyses. The LHCb experiment will undergo a major upgrade during the second LHC long shutdown (2019–2020), improving many of its detector systems in order to sustain the current particle identification performance in conditions of a five-fold increase of the instantaneous luminosity (up to 2 × 10 33 cm−2 s−1 ) compared to the current running conditions. In particular, a substantial change in the LHCb trigger and read-out schemes will be implemented to allow 40 MHz continuous data taking. The RICH detectors will be upgraded by installing new single-photon detectors (multi-anode photomultiplier tubes in place of hybrid photo-detectors) read out by 40 MHz capable electronics, and by modifying the upstream RICH optics and mechanics. An overview of the RICH upgrade program is presented, including a summary of the expected performances and the result of the latest tests of the complete photo-electronics chain in the laboratory and test-beams.
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